March 9-11: Clubs are permitted to enter into contract negotiations with certified agents of players who will be Unrestricted Free Agents at the end of the current League Year.

March 12 : Prior to 4:00 p.m., New York time, clubs must exercise options for 2013 on all players who have option clauses in their 2012 contracts.

March 12: Prior to 4:00 p.m., New York time, clubs must submit Qualifying Offers to their Restricted Free Agents with expiring contracts and to whom they desire to retain a Right of First Refusal/Compensation.

March 12 : Prior to 4:00 p.m., New York time, clubs must submit a minimum salary offer to retain exclusive negotiating rights to their players with expiring 2012 contracts and who have fewer than three seasons of free agency credit.

March 12 : All 2012 player contracts will expire at 4:00 p.m., New York time.

March 12 : Top-51 Begins. All clubs must be under the Salary Cap prior to 4:00 p.m., New York time.

March 12 : The 2013 League Year and Free Agency period begin at 4:00 p.m., New York time.

March 12: Trading period begins at 4:00 p.m., New York time, for 2013 after expiration of all 2012 contracts.

July 15 — At 4:00 p.m. New York time, deadline for any club that designated a Franchise Player to sign such player to a multi-year contract or extension. After this date, the player may sign only a one-year contract with his prior club for the 2013 season, and such contract cannot be extended until after the club’s last regular season game.

Mid-July — Clubs are permitted to open preseason training camp for rookies and first-year players no earlier than 22 days prior to the club’s first preseason game. Veteran players (defined as a player with at least one pension-credited season) other than quarterbacks or “injured players” (as defined in CBA Article 21, Section 6) may report to a club’s preseason training camp no earlier than 15 days prior to the club’s first scheduled preseason game or July 15, whichever is later.

Veteran quarterbacks and injured players may be required to report to the club’s preseason training camp no earlier than five days immediately prior to the mandatory reporting date for all other veteran players, provided the club has already opened (or simultaneously opens) its official preseason training camp for all rookies and first-year players.

A three-day acclimation period will apply to players who are on a club’s roster up to and including the mandatory veteran reporting date. Players who join the roster after that date may practice (including wearing pads) and play immediately after passing a physical.

July 22* — Signing Period ends for Unrestricted Free Agents to whom a “June 1 Tender” was made by prior club. After this date and until 4:00 p.m., New York time, on the Tuesday following the 10th weekend of the regular season, prior club has exclusive negotiating rights.

(* — or the first scheduled day of the first NFL training camp, whichever is later.)

August 6 — Deadline for players under contract to report to their clubs to earn an Accrued Season for free agency.

August 6 — If a drafted rookie has not signed with his club by this date, he cannot be traded to any other club in 2013, and may sign a player contract only with the drafting club until the day of the draft in the 2014 League Year.

August 8-11 — First Preseason Weekend.

August 15-19 — Second Preseason Weekend.

August 22-25 — Third Preseason Weekend.

August 27 — Prior to 4:00 p.m., New York time, clubs must reduce their rosters to a maximum of 75 players on the Active List.

August 28 — All tryouts on this date and for the remainder of the season must be reported to the League office.

August 29 — Final Preseason Games.

August 31 — Prior to 6:00 p.m. New York time, clubs must reduce rosters to a maximum of 53 players on the Active/Inactive List.

August 31 — Simultaneously with the cut-down to 53, clubs that have players in the categories of Active/Physically Unable to Perform or Active/Non-Football Injury or Illness must select one of the following options: place player on Reserve/Physically Unable to Perform or Reserve/Non-Football Injury or Illness, whichever is applicable; request waivers; terminate contract; trade contract; or continue to count the player on the Active List.

September 1 — Claiming period for players placed on waivers at the final roster reduction will expire at 12:00 p.m., New York time.

September 1 — Beginning at 12:00 p.m. New York time, clubs may establish a Practice Squad of eight players by signing free agents who do not have an Accrued Season of free agency credit or who were on the 46-player Active List for less than nine regular season games during each of any Accrued Seasons. A player cannot serve on the Practice Squad for more than three seasons.

September 1 — Final day of preseason training camp for all clubs, as defined in CBA Article 23, Section 9.

September 3 — After 4:00 p.m. New York time, a club is permitted to place a player on Reserve/Injured as “Designated for Return.”

September 4 — At 4:00 p.m. New York time, deadline for all NFL Player Contracts, Practice Player Contracts, tender offers, and miscellaneous amounts to fit within each Club’s 2013 Salary Cap, in anticipation of the midnight expiration of the Top 51 Rule.

September 5 — At 12:00 a.m. New York time, the Top 51 Rule expires for all NFL Clubs.